The cause of the fire at the Cuba Libre club in Rouen, Normandy, is believed is have been accidental

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At least 13 people were killed after a fire broke out in bar in France, police said early Saturday local time.

The cause of the fire at the Cuba Libre club in Rouen, Normandy, is believed is have been accidental, a Rouen police commander told NBC News. A number of others were injured, police said, but an exact number was not immediately available, NBC News reported.

The local Paris-Normandie newspaper reported that the fire broke at around midnight as young people were gathered at the bar celebrating a birthday.

It's the second tragedy in Normandy in the a little more than a week. An elderly priest was murdered by knife-wielding attackers linked to the terror group ISIS that took several nuns and worshippers hostage in Saint-Etienne-du-Rouvray on July 26. Both attackers were later shot dead by police.